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The activity concentrations of 226 Ra, 232 Th and 40 K in fifty granite samples collected from five different quarry industries in Ondo State, Nigeria, were determined using gamma-ray spectrometry. The mean activity concentrations for each industry ranged from 16.7(6.4) to 85.4(23.0), 62.4(10.1) to 113.6(7.6), and 1315(136) to 1551(84) Bq.kg-1 for 226 Ra, 232 Th and 40 K, respectively. The values in parenthesis are the standard deviations. When compared with results from some parts of the world, the 226 Ra and 232 Th contents were lower, whereas the 40 K content was similar. Using different approaches to estimate the potential radiological hazard of the samples, the results obtained were below the recommended maximum limits. This shows that the radiological hazards associated with the use of the granites examined in this study as building material are within the acceptable limit.

Measurement of natural radionuclides and dose assessment of granites from Ondo State, Nigeria